The text of this manuscript concerns the characteristics of different kinds of animals, plants and stones. It seems to have been made for a librarian of the Benedictine abbey at Rochester, and its artist also worked on a Psalter probably made for a London patron; he therefore probably moved around Southeast England. The illumination was left unfinished, however, so it may be that the librarian ran out of money, or that the artist was called away to another project. The miniature illustrates an unusual feature of apes: when a mother gives birth to twins, she loves one and despises the other. If chased, she carries one in front of her, and the other on her shoulders, but if she gets too tired she abandons the one she loves.